The Triode Guild is very active in Vienna, which is a city that has thousands of
variations in cream, which explains their love of triodes. Helmut Mueller-Guttenbrun,
whose tribal name is Hymi The Cynic sent me this article which indicates just how
senstive we are all becoming to magnetic forces.......

The superiority of oxygen free copper or silver needs no further discussion if you look
at the microphotos of normal - cold drawn - copper wire and its millions of crystal
boundaries. One really needs not beeing Einstein to know that smooth electron flow is
always better than sqeezing the poor electrons through a wire with lots of little diodes
-like the turbulent flow of water through a dirty tube with lots of lime deposit.
Didnt you once finely polish the intakes of your hotrodded engines?

Interestingly there are only few OPT manufacturers who offer windings with age
annealed copper or oxygen free copper. The Ohno Continuous Casting
Process with preheated die was recently reintroduced in America by a
cable company named Harmonic Technology. But these guys seem only to be
interested in selling audio cabling for big money, not spools of laquered copper wire (of
OCC quality) to OPT winders. I think this could be part of a quantum leap in OPT quality!

Another point of commercial compromise lies in the core material and geometry.
Anybody tells you about using the finest M6 laminations- nobody tells you about permalloy
or amorphous materials (glassmetal) Only Sakuma said that these Tamuras with
amorphous strip cores are much superior than OPTs with steel cores! Even you
didnt mention which version of the Sun PP amp (eventually with amorphous OPTs)
you auditioned?

I believe firmly that the use of advanced core materials and ultrapure copper wire will
lead to much superior OPTs in the future. But you mentioned it: Only if WE start
demanding these materials.

It would be fine to see other american OPT winders than LeFevre dealing with these
things. One of the virtues of MagneQuest is they are taking the risk of trying new paths,
not only tumbling along in the dust with all the other mainstream - guys.

Another firm believe of mine - although I have no personal proof for this - is the
theoretical advantage of splitting the OPT into a big Choke for lots of Hys for good
bass and a small sized OPT with no dc to cope with. This OPT can be optimized for sound
quality - with nickel or amorphous core - and a non resonant high q condenser
(paper in oil) in the ground leg should do no bad things - as grego Sanguinetti reports in
SP#15.

Back EMF: If you are using a big woofer with heavy membrane and coil and soft surround
for low resonance, working into an undamped reflex enclosure and you want to drive this
monster with a single 300B you are likely to get into bass problems. Its like a
Vespa 50cc engine in a cadillac. We tried driving a 15 inch PA woofer with a single 845
and out came disastrous slow and contourless bass! Anybody who tried it , knows these
restrictions. Anyway, with system fine tuning one can compensate some of these defects but
dont think you can reinvent the laws of physics.

Homogenity of multiple Driver speaker Systems: The shared experience of some Viennese
Horn people (with me) is that time alignment between drivers is critical, but the
uniformity of directionality ( in the crossover region )is another very important
parameter for good sound. The combination of midrange horns with ONKEN enclosures or any
other direct radiator is always inferior to a woofer with a short horn - like Altec A5
with alnico driver. Thats a logic explanation for so many people happily living with
these speaker monsters, regardless of the missing two octaves. Not to mention that the
woofer needs to be fast!